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Both USB ports stopped communicating on my D600, they have power, my optical mouse still lights up, no device works on the ports, everything is fine in Device manager in Dual boot XP and W7. Checked the bios, not much in there for USB.

No usb device shows up when I use the F12 boot device menu either, so it must be some hardware issue.

I have another hard drive with Ubuntu on it, popped it in and USB does not communicate with it either.

Appears to have 5v but no communication, any Ideas besides another motherboard or USB card for the pcmcia slot (these don't work to well from my research)?

I mostly use them for mass storage devices and pcmcia slots don't supply enough power for these devices.

Thanks to all who answer with last ditch efforts. I hate to give up on it, its been good to me and still runs rather well for its vintage.

EDIT: I did inspect the ports with a flashlight and did a partial disassembly of the laptop in an attempt to check the solder joints, but would require complete motherboard removal to see them, that is where I stopped.

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Given the range of systems you say can't see it. I would also suspect a problem in the port itself. Because it seems that you can get these for under $10 on Ebay
search for "dell d600 usb board"
I think I might be tempted to give one of them a try.

http://support.dell.com/support/edocs/systems/latd600/sm/index.htm

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Thanks, I have never had a usb port become defective, but I guess it could be a first in 15 years, I did inspect it with a flashlight and did a partial disassembly of the laptop in an attempt to check the solder joints, but would require complete motherboard removal to see them, that is where I stopped. –  Moab Jan 17 '11 at 21:50
    
Damn, it is separate from the motherboard, thanks again! Ordering one now! –  Moab Jan 17 '11 at 21:53
    
Because I have several of these I'll be interested to follow this for future reference. That thing sure looks like it just connects via a cable though. (posted before your comment refreshed) Good luck –  Dennis Jan 17 '11 at 22:03
    
At least I have hope now, just ordered a used one from eBay, $3.69 free ship! Thanks again Dennis, I will give it a little time then accept your solution. –  Moab Jan 17 '11 at 22:08
    
OMG, I read your bio, I am from Ohio originally, Columbus, then Dayton, moved to Texas in 76, don't miss the weather. Nice M.A.N. website! –  Moab Jan 17 '11 at 22:10
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